Lock attachment for sockets.



R. WMILLER & J'. A. MOLIN LOCK ATTACHMENT FOR SOCKETS.

APPLIGATIOH FILED MAY 8, 1914.

1 l 3 1 {YQS 5 Patented Mar, 16, 1915.

EGBEM HELLER AND 5031*? ARVIDEI'GLIN, QF YQNKERS, NEW YORK.

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Be it known that we, Rosana V. Mullins, a citizen of the'l-Jnited States of America, and a resident 'Iofonkers; Westchester county, and State of New York, United States of America, and doma n. Moran, a

citizen of the United States of America, and a resident-of Yonkers, W'estchester county, and @tate ot New York, I United State of America; have invented certain new and useful improvements in LockAttachinents ior'sockets, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof. 4

Our invention relates to contact sockets and particularly to such as are adapted to receive a screw-threaded plug or base and to lock the inserted ping or base against unwarranted removal.

Que object ofour invention is to provide a particularly simple and improved looking device which shall effectively preventthe removal of a plug-or base without the use of a suitable key, but which shall not at all interfere with the insertion of the plug or base.

Another object of our invention is to provide'an attachment for standard Edison base lamp sockets which may very readily be applied to a socketwithout electrically connecting its casing to either of the socket terminals and which may be manufactured in large quantities at small cost.

Other objects and advantages of our in vent-ion will be set forth hereinafter, and in order that our invention may be thoroughlyunderstood, we will now proceed to describe the same in the following specification and then point out the novel features thereof in appended claims.

Figure 1 is a partially sectional elevation of a lamp socket equipped with our invention, a lamp being shown in position as inserted in the socket. Fig. 2 is a sectional elevation on the line 2-2 of Fig. 1, and Fig. 3 is a sectional plan View on the line 3- 3 of Fig. 1. A portion of the socket is shown in section on a larger scale in Fig.

4, the details of our improved attachment.

being clearly disclosed. Fig. 5 is a sectional view, taken on the line 55' of Fig. 4;":

- 10. represents a lamp socket of an-y well 'lmown form, having a metal shell or casing ii, a helically corrugated-genteel; socket '12,, and interposed insulating elee rei mg ring 17. a

so that their points tend The attachment of our invention comprises a ring-shaped body 15 having a laterally projecting key socket lug 16, an insulatpair of-ears or clips l8,"and a pawl lock 19.

The ears or clips 18, extend in an axial direction from the insulated surface of the ring 15 to which they are secured and are cylindrically curved. Each clip is preferably provided with an extruded lugQl having transverse corraigations which are adapted to cooperate with the corrugated surface of the ,contact socket 12.

The pawl lock 19 is disposed in a recess 25 in the-insulated surface of the ring 15 and is pressed against a shoulder 26 of the ring by a spring 27. It is so formed that when it is in engagement with the shoulder, a sharp cutting point 28 extends radially inward so as to prevent the backward movementof a base or plug which is inserted in the socket as hereinafter explained.

The key socket lug 16 is hollow and a pin 29 which isiitted into the pawl lock 19 at one end is'disposed within it. Y

The arrangement of parts is such that a socket Wrench or key 30 may be readily inserted in the hollow projection 16 and fitted onto the end of the pin which may be triangular or square in section, the lock 19 being released by inerely turning the key in opposition to the spring 27. The lock is free to be swung out of the way in one direction and the arrangement of parts is such that this can be readily accomplished by the plug or base as it is inserted in the usual way, the lock acting as a ratchet in permitting an advance movement of the base but absolutely preventing a backward movement of the base or plug-such as is necessary in removing the same.

Projecting from the side of the shank of the key is a lug 31 which when the key has been turned to release the pawl lock may be pushed up into a recess 32 cut in the lower,

edge of the socket 16 to hold the pawl in its unlocked position against the action of spring 27 so that the operator may have both hands free to unscrew the lamp from the socket.

As clearly shown-in Figs; 1 and 5, the extruded lugs 21 are out from the ears of which; they form parts and have-diamondshaped ends 21 which are bent inwardly to dig into the he'lically corrugated outer walls of the contact socket 12 and prevent the attachment from turning with the lamp base 40 or other plug which may be inserted in the socket. The edges of the ears are curved outward as at 23 to engage the insulating sleeve 13 for the same purpose.

The attachment may readily be applied to any socket of the usual form by merely forcing the ears or clips 18 between the helically corrugated exterior walls of the socket contact 12 and the insulating sleeve 13. The insulating ring 17 which covers the recess 25 of the ring 15' constitutes a stop and engages the outer edge of the shell or casing 11 as clearly shown in Fig. 4. This outer casing or shell is therefore electrically Separated from the attachment and'consequently is not connected to the electricallyactive parts of the socket through. any of the metal parts of the attachment.

Structural modifications will be effected within the spirit and scope of our invention and we intend that only such limitations be preventing the removalof a base orplug afterit has been inserted in the socket.

2. An attachment for. contact sockets comprising a member having curved ear projecv tions adapted to be forced into a socket, and having means for preventing rotary movement of the attachment and means for preventing the removal of a base or plug without interfering, with its introduction into the socket.

3. An attachment for contact sockets comprising a member having curved ear projections adapted'to be forced .into a socket longitudinally, means oh said projections for ')reventing rotary movement of the attachment, and a pawl lock adapted to be released by a suit-able key for preventing the removal of a base or plug which has been inserted in the socket. 4. An attachment for contact sockets comprising a member having curved on r projections adapted to be forced into a socke and having means for preventing rotary move ment of the attachment, a pawl look, a spring arranged to press said pawl into locking position, a. key for moving the lock out of locking position, and means for bold .ing the key and the lock against the action of the spring.

5. An attacln'nent for contact sockets con1- prising a ringshaped body having a laterally projecting key socket lug. a pair of oylindrically curved ears or clips adapted to be inserted between the usual insulation ment of the attachment a pawl lock mounted in said ring and extending into the openingvwithin the ring, a shoulder for limiting rotation of the pawl lock in one direction, and a spring for yieldingly holding the lock projection against rotative movement in. the opposite direction.

7." An attachment for contact sockets comprising" a ring-shaped body having a later-' ally projectin key socket lug and a pair of cylindrically curved ears or clips adapted to be inserted between the usual insulation and the outer walls of a contact socket, and

having means for preventing rotary movement of the attachment a pawl lock mounted in said ring and extending into the opening within thering, a shoulder for limiting rotation of the pawl lock in one direction, a spring for yieldingly holding the lock projection against rotative movement in the opposite direction, and' a pin secured to said pawl lock-and extending iiito said key socket projection, the outer end of said pin being shaped to receive a suitably formed releasing socket key.-

8. An attachment for contact sockets comprisinga member having curved ear projections adapted to be forced into a socket, and having means for preventing rotary movement of the attachment a pawl lock pivotally supported in said member at the side thereof and having an outwardly extending pin, the end of said pin being shaped to receive a key. a spring arranged to press said pawl into locking position, a key socket surrounding the pin, the edge of said key socket being provided with a recess, a key arranged to engage the pin to move the pawl out. of locking position. and a lug projecting from the key and :1 T d to be moved into said key socket raw hen the key has turned t pawl out o' locking position to hold id pawl out ts locking position against the action 11-: the spring. 9. An ntlaclnuont for contact sockets comprising a member ha ving rnrv ed car pro'iees tions adapted to be forced into a socket longitudinally. miruded pinnled lugs projecting from said ears adapted to engage a metallic portion oi the Contact socket. the edges of said projections being curved outwardly to engage another part oi the socket, a pawl lock pivoially supported in said member at to press said pawl into locking position, a

key socket surrounding the pin, the edge of said key socket being provided With a re cess, a key arranged to engage the pin to move the pawl out of looking position, and a lug projecting from the key and adapted to be moved into I said key socket recess when the key has turned the pawl out of its locking position to hold said pawl out of its locking position against the action of the spring.

In Witness whereof, We have hereunto set 15 our hands in the presence of two subscribing Witnesses, this 5th day of May, 1914.

ROBERT V. MILLER. JOHN ARVID MOLIN. Witnesses:

NATHANIEL G. MERRILL, MICHAEL GRIMES. 

